zorro.c
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上传日期:2013-04-10
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文件大小:5k
- /*
- * $Id: zorro.c,v 1.1.2.1 1998/06/07 23:21:02 geert Exp $
- *
- * Zorro Bus Services
- *
- * Copyright (C) 1995-2000 Geert Uytterhoeven
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file COPYING in the main directory of this archive
- * for more details.
- */
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/zorro.h>
- #include <asm/setup.h>
- #include <asm/bitops.h>
- #include <asm/amigahw.h>
- /*
- * Zorro Expansion Devices
- */
- u_int zorro_num_autocon = 0;
- struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];
- /*
- * Zorro Bus Resources
- * Order _does_ matter! (see code below)
- */
- static struct resource zorro_res[4] = {
- /* Zorro II regions (on Zorro II/III) */
- { "Zorro II exp", 0x00e80000, 0x00efffff },
- { "Zorro II mem", 0x00200000, 0x009fffff },
- /* Zorro III regions (on Zorro III only) */
- { "Zorro III exp", 0xff000000, 0xffffffff },
- { "Zorro III cfg", 0x40000000, 0x7fffffff }
- };
- static u_int zorro_num_res __initdata = 0;
- /*
- * Find Zorro Devices
- */
- struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
- {
- struct zorro_dev *dev;
- if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO))
- return NULL;
- for (dev = from ? from+1 : &zorro_autocon[0];
- dev < zorro_autocon+zorro_num_autocon;
- dev++)
- if (id == ZORRO_WILDCARD || id == dev->id)
- return dev;
- return NULL;
- }
- /*
- * Bitmask indicating portions of available Zorro II RAM that are unused
- * by the system. Every bit represents a 64K chunk, for a maximum of 8MB
- * (128 chunks, physical 0x00200000-0x009fffff).
- *
- * If you want to use (= allocate) portions of this RAM, you should clear
- * the corresponding bits.
- *
- * Possible uses:
- * - z2ram device
- * - SCSI DMA bounce buffers
- *
- * FIXME: use the normal resource management
- */
- u32 zorro_unused_z2ram[4] = { 0, 0, 0, 0 };
- static void __init mark_region(unsigned long start, unsigned long end,
- int flag)
- {
- if (flag)
- start += Z2RAM_CHUNKMASK;
- else
- end += Z2RAM_CHUNKMASK;
- start &= ~Z2RAM_CHUNKMASK;
- end &= ~Z2RAM_CHUNKMASK;
- if (end <= Z2RAM_START || start >= Z2RAM_END)
- return;
- start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;
- end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;
- while (start < end) {
- u32 chunk = start>>Z2RAM_CHUNKSHIFT;
- if (flag)
- set_bit(chunk, zorro_unused_z2ram);
- else
- clear_bit(chunk, zorro_unused_z2ram);
- start += Z2RAM_CHUNKSIZE;
- }
- }
- static struct resource __init *zorro_find_parent_resource(struct zorro_dev *z)
- {
- int i;
- for (i = 0; i < zorro_num_res; i++)
- if (z->resource.start >= zorro_res[i].start &&
- z->resource.end <= zorro_res[i].end)
- return &zorro_res[i];
- return &iomem_resource;
- }
- /*
- * Initialization
- */
- void __init zorro_init(void)
- {
- struct zorro_dev *dev;
- u_int i;
- if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO))
- return;
- printk("Zorro: Probing AutoConfig expansion devices: %d device%sn",
- zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");
- /* Request the resources */
- zorro_num_res = AMIGAHW_PRESENT(ZORRO3) ? 4 : 2;
- for (i = 0; i < zorro_num_res; i++)
- request_resource(&iomem_resource, &zorro_res[i]);
- for (i = 0; i < zorro_num_autocon; i++) {
- dev = &zorro_autocon[i];
- dev->id = (dev->rom.er_Manufacturer<<16) | (dev->rom.er_Product<<8);
- if (dev->id == ZORRO_PROD_GVP_EPC_BASE) {
- /* GVP quirk */
- unsigned long magic = dev->resource.start+0x8000;
- dev->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;
- }
- sprintf(dev->name, "Zorro device %08x", dev->id);
- zorro_name_device(dev);
- dev->resource.name = dev->name;
- if (request_resource(zorro_find_parent_resource(dev), &dev->resource))
- printk(KERN_ERR "Zorro: Address space collision on device %s "
- "[%lx:%lx]n",
- dev->name, dev->resource.start, dev->resource.end);
- }
- /* Mark all available Zorro II memory */
- for (i = 0; i < zorro_num_autocon; i++) {
- dev = &zorro_autocon[i];
- if (dev->rom.er_Type & ERTF_MEMLIST)
- mark_region(dev->resource.start, dev->resource.end+1, 1);
- }
- /* Unmark all used Zorro II memory */
- for (i = 0; i < m68k_num_memory; i++)
- if (m68k_memory[i].addr < 16*1024*1024)
- mark_region(m68k_memory[i].addr,
- m68k_memory[i].addr+m68k_memory[i].size, 0);
- }
- EXPORT_SYMBOL(zorro_find_device);
- EXPORT_SYMBOL(zorro_unused_z2ram);
- MODULE_LICENSE("GPL");